Just 'cause you whiffed doesn't mean they hit. If they see that you fold to C-bets too often, they'll exploit you.

When you feel you're getting pushed around with air, push back with your bluff catchers once in 3 or so. You'll actually catch a pair 1 in 3 flops (sometimes the pair is on the board), so if the villain is pushing more than that, he's just pushing to exploit.